期刊
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
卷 46, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1751-8113/46/12/125301
关键词
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资金
- Royal Society [JP090467]
- EU (Marie Curie) [CIG 293993/ENFOQI]
- BMBF (Chist-Era Project QUASAR)
Given a multiparticle quantum state, one may ask whether it can be represented as a thermal state of some Hamiltonian with k-particle interactions only. The distance from the exponential family defined by these thermal states can be considered as a measure of complexity of a given state. We investigate the resulting optimization problem and show how symmetries can be exploited to simplify the task of finding the nearest thermal state in a given exponential family. We also present an algorithm for the computation of the complexity measure and consider specific examples to demonstrate its applicability.
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